In large bowl, beat eggs, butter and vanilla with electric mixer until well combined. With electric mixer on low speed, add flour mixture to egg mixture 1 cup at a time, scraping bottom and sides of bowl as needed; mix until just combined. Beat in 1/2 cup chopped Candy Melts candy and hazelnuts. On lightly floured surface, pat into a 12 in. x 4 in. log; place in middle of prepared cookie sheet.